Pressor.



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I: 'www No. 841,141. PATENTE) .11.11. 15, 1907.

A. H. GIBSON. PRESSR.

- APPLICATION FILED SEPT. 12.).905.

3 SHEETS-SHEET 2.

:110. 841,141. PATENTEDJAN. 15, 1907.

' A. H. GLfBSoN.

PRBSSOR.

APPLIOATIUN FILED SEPT. 12, 1905.

3 SHEETH-BEEET 3.

nuire srfrrss PAFNT @il ARTHUR H. GIBSON, OF EASTON, lENNSYLVANlA, ASSIGNOE TO THE INGERSOLL-SERGEANT DRlLL COMPANY. OF NEWI7 YORK, N., Y., A. CORPORATION OF WES'l VlRGINIA.

PRESSQR.

Specication of Letters Patent.

Patented Jan. I5, 1907..

To nl( u-/mm/ it may concern:

Be it known that l, ARTHUR H. GIBSON, a subject of the King of Great Britain, and a resident of Easton, in the county of Northampton and State of Pennsylvania, have invented a new and useful improvement in lressers, of which the following is a specification.

The object of this present invention is to provide certain improvements in the construction, form, and arrangement of the several parts of a presser of that type which is used for operating a tool by the use of reciprocating columns of air 5 and it is more particularly devoted to means for gradually regulating air-pressures upon both sides of the presser-piston in a very simple and complete manner by the use of a single-acting pump combined with the presser.

A further object is to provide other improvements in the presser whereby. the leakage of oil from the crank-shaft casing is not only obviated, but a proportion of the oil is used to goed eiect in connection with the lubrication of the pump portion of the presser.

In the accompanying drawings, Figure 1 represents the presser in vertical long] dinal central section, the same being combined with an electric motor, which is shown in` side elevation, the whole being mounted en a portable platform, also shown in longitudinal section. Fig. 2 is a artial top plan and transverse longitudina central section of the parts shown in Fig. 1. Fig. 3 is a front view of the presser. Fig, 4 1s an enlarged detail section through the inlet and discharge valves. Fig. 5 is a section taken in the plane of the line A A of Fig. 4, and Fig. 6 is a section taken in the plane of the line B B of Fig. 4.

The portable platform or base Aof the presser is denoted by 1. An electric motor 2 of a well-known and a proved constructionA is mounted on the p atform, the driving-gear 3 of which motor intermeshes with the gear 4 ef the crank-shaft 5 of the presser. This crank-shaft 5 is mounted in suitable bearings 6 and 7 inthe end plates 8 and 9 of a closed casing 10. A switch-controlling device 2* of approved construction isomounted on the motor 2 for controlling the starting and stopping of the same. l y n The presser-cylinder 1s denot d by 11 its front head l2 being extended forwardly te form the pump-cylinder 13 and its rear head 14 being extended rearwardly to form a cylinder 15 for the lessor-piston trunk. In practice the rear cad 14, cylinder 15, and crank-shaft casing may be formed integral. The presser-piston is of the 4trunk-piston type, the piston-head being denoted by 16 and the hollow trunk, which slides in the cylinder 15, being denoted by 1.7. This presserpiston is further provided with a forward eX- tension 18, which is fitted to slide within the cylinder 13 and fermstogether therewith the presser-cylinder. A

A pitman 19 connects the presser-piston with the crank-shaft 5, whereby the presser and pumpl may be operated from 'the motor through the said crank-shaft. l

Inlet and' discharge valves 20 `21 are located in the front head 22 of the pump-cylinder, which front head'also serves as a valvecasing. An inletort 23 leads to the under from the upper side of the `valve '20 into the charge-valve 21, and a ort 26 leadsfrom the top of the discharge-va ve to a pipe 27, which forms a passage from the'tep of the said discharge-valve to a port 28 'in the presser-cylinder 11.

vThe tubes which lead' te tlie tool-cylinder (not shown herein) and throu l1 which the columns of air are reciprecated y the movement of the presser-piston are denoted by 29 and 30, the ports for the said pipes being denoted by 31 32, respectively, which ports open through the front and rear heads of the presser-cylinder to the front and back of the piston.

A passage leads through the pipe 33 from the interior ,of the crank-shaft casing 10 te the inlet-portf23 just below theinlet-valve 20, the passage at this point being directed u' wardl so as to causefthe mixed air and oil whic passes irorrlL the pipe 33 to be directed past'I the inlet-valve' 20-when the valve is o cned. The presser is supported upon the ase 1 bye'. suitable upri ht 34.

- While l have shown an e ectric motor for driving the presser, it is t'o be understood that side of the inlet-va ve 20, and a port 24 leads the air-pump for raising the air-pressure in pump-cylinder 13. A port 25 leads from the pump-cylinder to the under side ofthe dis-' IOO any other ttyl-pe of meter may be used, if se desired, for t is purpose.

In operation, supposing the partsl te beinsame and force it out through the port 3l and pipe 29 and at the same time permit the expansionvef theair from the pipe 80 and port 32 inte the space back ofthe piston-the air in the space in front of the pumpiston will be forced out through the disc argevalve into the pipe 27 and from thence through the port 28 inte the Aspace back of th'e presser-piston as seen as the piston is moved forwardly a sufficient di tance to uncover the port to its rear side'. rhis Will raise thepressureofarentherearsideofthepressor- 'istonl at a time When the air therein is at its oWest pressure, and thereby When the-least resistance Will be imparted 'to 'the inrush of theadditienal supply ef air through the port 28 and pipe 27 from the pump-cylinderchamber.'

After the presseriston has reached the limit of its forWar' movement and as it starts en its inward movement for forcing the air'threugh the port 32 and ipe 30 and for permitting the expansion o air from the pipe 29 andpo4 t 31 the inlet-valve 2O will be o `enedfthus ermitting thepump-cylinder c amber to be illed with a new supply of air.

vAt'the same-time air will 'be compressed in the pi e 27 because ef its end being closed by the c esure of the discharge-valve 21.

soon as -the presser-piston passes the port 28 of the said pipe to open it into the space in front ofthe presser-piston the air which hasv been compressed in the pipe27 will be fed te the space in the presser-cylinder in front of the lpresser-piston at a time when the pressureof air in this space is at a minimum.

It Will thus be seen that by properly locaty ing the port 28 With respect to the stroke of the presser-piston and also lby changing the size or length of thepipe 27 theI proper 'amount of additional alrpressure may be supplied to beth sides of the presser-,piston to suit lthe particular requirementsfor each presser. B the use of a single-acting pump only it Wil furthermore beseen thatthe pressures en beth sides of the presser-piston may be kept equal, er one sideef the presserpiston ma be pressure t an t e other side. Y v

it has beenfound in ractice that the'pressure in the crank-sha y raised by theleakage of pressure past `the pisten-trunkw ,and 'in the `case ,ef-a closed crank-shaft casi havin no relief vtln'efmix- 'tureof'air and ei would e forced out along the'crank-shat bearings Band 7, and thus' vcause a yew disa eeable-`spayin 'of the` game when release ,at the ends eft ebearprovided With a greater mean A casing is gradually from the interior of -thecranlr-shaft casing Vis forced from the end of the pipe 33 past the said inlet-valve: The oil of this mixture serves also'to lubricate the pump and all of the Working parts adjacent to the same. As

this jet of mixed eil and air only exists dur-.

ing the suction-stroke of the pump and While the inlet-valve is being opened for drawing in air through the inlet 23 there is no less ef oil, and, furthermoreLthere Will bene escape of eil When the apparatus is at rest.

What I. claim befe/my invention isl. ,A` presser'- cylinder, airtubes leading therefrom, a presser-piston, a pump, its inlet and' discharge valves and a passage leading fiom the disdharge-valve of the pump te the cylinder and arranged to be alternately opened te the opposite sides of the presserpisten.

2. A presser-cylinder a pump-cylinder arranged 4in alinement, `air-tubes leading from the pressor-cylinlder, inlet and discharge valves for the pump -cylinden connected presser and pump pistons and a passage leading from the discharge-valve of the pump to the presser-cylinder and arranged te be alternately'opened to the opposite sides of the presser-piston. s

3. A presser-cylinder, a. pump-cylinder, air-tubes leading from the presser-cylinder, inlet and discharge valves for the pump-cylinder, connected vpressery and pump pistons and, a passage leading from the dischargevalvevef the pump te the presser-cylinder in a position to be alternately. opened to the opy posite sides of the presser-piston, communication being closed from the interior of the4 pumpcylinder to the passage when the presser-pistony is moved in one direction Land opened When the presser-piston is moved in t e other direction. y f

4. A presser-cylinder, its piston, a pumpcylinder, its piston, inletand discharge valves for the pump-cylinder, air-tubes'leading from the presser-c linder and a passage lead-ing` ICO ref,

from the disc arge-valve te -the'presser-'cyl-'- inder. and arranged'to'. be alternately opened te the op osite sides ofthe presser-piston, the vsaid ischarge-valve 'being arranged to open and close one end of the passage accorde ing to the direction in which the, pressor-pis+" tenis moved whereby the said passage may'- "be opened to the opposite sides of the presser- I iston whereby the pressurev of air may be raised u on opposite sides of the presser-piston by t e use of the said single-acting pump. 6. A presser including a trunk-piston, a closed crank-shaft oasin anda pump,V inlet and discharge valves for t e pump, anda pas-l sage leading from the closed crank-shaft easing to the inlet-valve of the pump as and for the purpose set forth.

7. A closed crank-'shaft easingJ a pressercylinder, a pumpcylinder, inlet and discharge valves for t e pump-cylinder, airtubes leading from the presser eylinder, presser and pump pistons, a passage leading tember, 1905.

ARTHUR H. GIBSON.

Witnesses:

H. D. MAXWELL, i WARD RAYMQND. 

